That is absolutely natural. It's always better to apply for adsense account after you have minimum 30 hubs and after your account is 6 months old. I know this its tough to hear but thats the only way around.
Meanwhile, consider this 6 months as your learning period and work on articles and attracting more traffic. There are tons of ways online to get money if you know how to make traffic. One such eg: is my hub on.
Do check out several other oppertunities to earn online.
All the advertising networks need some amount of text or content on web pages for their code to work properly and Google Adsense is the best of them. Google Adsense requires content quality as well instead of quantity and then and only then will your application be approved if you have good quality content in sufficient quantity.
From your details question, it seems you haven't enough hubs and from your hubtivity, you wrote only 3 hubs, so it's not enough to get approved.
1. Write more hubs (I've got approved with 7 hubs you could see).
Good luck, wish your app get approved soon.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.